diff --git a/src/Init/Data/Repr.lean b/src/Init/Data/Repr.lean
index f5a4706ec3c5..2afd2f91f8a1 100644
--- a/src/Init/Data/Repr.lean
+++ b/src/Init/Data/Repr.lean
@@ -103,11 +103,11 @@ instance {p : α → Prop} [Repr α] : Repr (Subtype p) where
 
 namespace Nat
 
-def digits : Array Char :=
+def digitChars : Array Char :=
   -- Array syntax not available yet
   Array.mk ['0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f']
 
-def digitChar (n : Nat) : Char := digits.getD n '*'
+def digitChar (n : Nat) : Char := digitChars.getD n '*'
 
 def toDigitsCore (base : Nat) : Nat → Nat → List Char → List Char
   | 0,      _, ds => ds